Excavator.



2 Sheets-Sham. I.

Patented Aug."'27, l90lii G. W. KING &. H. J. BARNHART.

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EXCAVATOR. v (Application filed July 1, 1901.)

WITNESSES 1 UNITED STATES PATENT OFFICE.

GEORGE W. KIN G AND HARRY J. BARNHART, OF MARION, OHIO, ASSIGNORS TO THE MARION STEAM SHOVEL' COMPANY, OF SAME PLACE.

EXCAVATO R.

SPECIFICATION forming part of Letters Patent No. 681,231, dated August 27, 19011.

- Applieation filecl July 1,1901.

To all whom it may concern- Be it known that we, GEORGE W. KING and HARRYJ. BARNHAR'I, citizens of the United States,'residingat Marion, in the county of 1 Marion and State of Ohio, have invented certain new and useful Improvements in Excavators, of which the following is a specification, reference being had therein to the accompanying drawings. 7

This invention relates to excavators, and more particularly to excavators of the type shown, for instance, in Letters Patent No. 578,751,'granted March 16, 1897, to George 7. King.

The present inventionrelates more particularly to the construction of that part of the apparatus knownas the A-frame, which is v a frame of inverted-V shape having its lower 1 end supported on the car or body portion of the excavator, while its upper end is connected with and serves to support the upper end of the boom.

Our present invention has for one of its obfijects an improved construction of the body '45 portion or leg members of this A-frame, wherebyits manufacture and repair are simplified. A further object of our invention is to prov vide an improved connection between the upper end of the A frame and the yoke to which the tie-rod supporting the boom is connected. A stillfurther object of our invention is to strengthen the jaws at the lower end of the A-frame and to provide an improved connection at said point between the A-frame and the body or'car of the excavator. To these and other ends our invention con sists in certain novel features, which we will now proceed to describe, and will then particularly point out inthe claims.

In the accompanying drawings, Figure 1 is y a side elevation of a portion of an excavator embodying our invention. Fig.2 is a front end elevation with the boom and its connections removed. Fig. 3is an enlarged detail per end of theA-frame. Fig. 4 is a detail front elevation, partly in section, of the up Serial No. 66,682. (No model.)

ture shown in Fig. 5. Fig. 7 is a plan section, enlarged, taken on the line 3 3 of Fig. 5. Fig. 8 is an enlarged plan section taken on the line 5 z of Fig. 2, and Fig. 9 is an elevation of the inner face of one of the innerchannel-bars.

In the said drawings, 1 indicates the car or body of the excavator, and 2 the boom, which is pivotally supported by the turn-table 3 and carries the usual dipper 4, with its handle 5.

6 indicates the A-frame as a whole, which is in the form of an inverted V, comprising two legs 7, united at their upper ends and diverging downwardly to the points where they are supported on the body 1. Each leg is composed of two channel-bars 8 and 9 and two flat plates 10 and 11, said plates being connected to the edges ofthe channel-bars by riveting. The upper ends of the legs are connected to a head-casting 12. The side plates 10 and 11 are riveted to the outer channel-bars 8 by means of rivets passing through the plates and through the flanges of the channel, which flanges are directed inward, the back of the channel being flush with the edges of the plates. The head-casting 12 is secured to the channels 8 and plates 11 by riveting, it being understood that the head-casting is shaped to receive the flanges of the channels 8, as indicated in Fig. at. The channels 9 terminate at the head-casting and are placed between the plates '10 and 11 with their backs inward, so that their flanges extend outward, and thus are available for riveting, the rivets passing through the plates and through the flanges ofthe channels. We propose to provide the inner channels 9 with apertures 13, as shown in Fig. 9, which aperturesserve to give access to the rivets in the outer channel in case these latter should become loose and permit their being replaced through said apertures in an obvious manner.

The head-casting 12 of the A-frame is pro vided with a journal 14., which receives the 5 collar 15, to which is connected the tie-rod 16, which supports the upper end ofthe boom 2. It will be observed that the construction is such thatthe strain on the yoke 15 tends to move this latter in an upward direction, zoo and in order to resist this strain we provide the upper end of the journal 14 with a collar 17, against which the yoke bears. It is desirable in order that the yoke should be light and strong that it may be made in a single piece, as shown, and in order to render this construction possible it is necessary to make the collar 17 removable, in order that the yoke may be placed in position and removed when necessary. In order to eflect this end, we form the journal 14; hollow, as shown in Fig. 3, and we secure the collar 17 on the upper end of the yoke by means of a plurality of pins 18, which pass through the collar and extend into the hollow interior of the journal, where they are held in place by cotter-pins 19, nuts, or other suitable fastening devices. By the employment of a number of short pins passing only through the collar and the shell of the journal and terminating within the shell We are enabled to attain the shearing resistance of a number of comparatively short small pins, which we find to be much more eifectual than the employment of a single pin passing entirely through the collar and through the journal. It will also be seen that with this construction the collar may be readily removed and replaced, so as to permit the removal and replacing of the yoke.

Referring now more particularly to the construction at the lower ends of the A-frame, it will be noted that each leg is provided with a foot-casting 20, secured within the members of the leg, as shown in Figs. 5, 6, and 7, being riveted to the plates 10 and 11 and to the channels 8 and 9. Its outer face is shaped to accommodate the flanges of the outer channel 8, and the inner channel 9 extends down some distance below its top and terminates there. The A-frame is hinged to the body of the structure to permit its being lowered for transportation and to permit its swinging forward without injury in case the back-support rod should break, and to this end the foot-casting terminates in two downwardly-projecting parallel lugs 21, having rounded lowerends, as indicated at 22, said lower ends resting on a correspondinglyshaped socket-casting 23, provided with an outside guard-flange 24. A pivot-pin 25 passes through the lugs 21, and around this pivot-pin passes the looped end of a U-bolt 26, which extends down into or through the body 1 andis there secured. Preferably each U-bolt extends downward through the jackjsupport casting 27 on that side of the body,

being provided with nuts 28 on its projecting lower ends. By reason of this construction we are enabled to dispense with nicety of fitting of the parts and take up any wear which may occur. The strains on the A-frame are both lifting and downward strains, so'that the connections at the foot are strained in opposite directions at different times, and any looseness which may exist at this part would rapidly increase with the ordinaryconstruction, in which the pivotpin 25 passes through fixed lugs on the body and leg and great nicety in the fitting of the pin 25 to its bearings would be required. By reason of the construction which we have devised any looseness of these parts may be taken up by tightening the U-bolts, so as to cause these latter to bear firmly on top of the pins while the lugs have a proper bearing on the socketcastings. I

In order to strengthen thelugs 21 and prevent breakage of the jaw formed thereby, we provide at the rear of said lugs a bridgepiece or lift 29, connecting the rear edges of said lugs and serving to more firmly unite the same, while at the same time affording ample space for the U-bolt 26.

Obviously some of the features of our invention may be embodied in an operative structure without requiring the employment of all of the remaining features. It is, moreover, also obvious that various modifications in the details of the construction hereinbefore shown and described may be made without departing from the principle of our invention, and we therefore do not wish to be understood as limiting ourselves to the precise embodiment of our invention hereinbefore set forth for purposes of illustration.

Having thus fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. An A-frame for excavators and the like, each leg whereof is composed of parallel channel-bars having their flanges extending in the same direction inward toward the central line of the frame, and front and back plates riveted to the flanges of the channelbars, substantially as described.

2. An A-frame for excavators and the like, comprising leg portions each composed of two parallel channel-bars having their flanges extending in the same direction inward toward the central line of the frame, front and back plates riveted to the flanges of the channel bars, and a head-casting riveted to the outer channel-bars and to the front and back plates, substantially as described. 7

3. An A-frame for excavators and the like, comprising leg portions each composed of two parallel channel-bars having their flanges extending in the same direction inward toward the central line of the frame, and front and back plates riveted to the flanges of the chan nel-bars, the inner channel-bars being provided with apertures whereby access may be had to the inner ends of the rivets of the outer channel-bars, substantially'as described.

4. In an excavator, the combination, with a boom and a tie-rod having an integral yoke, of an A-frameprovided with a hollow journal, a retaining-collar mounted on the journal above the yoke, and a plurality of pins extending through the collar and the wall of the journal, terminating within said journal and there provided with retaining devices, substantially as described.

5. In an excavator, the combination, with a car or body provided with socket-pieces, of an A-frame each leg whereof is provided with 1a transverse parallel lugs having rounded terminal bearing-surfaces to rest on the corresponding socket-piece, a transverse pin connecting the lugs, and a Ubolt passing over said pin between said lugs and adjustably connected at with the body, substantially as described.

6. In an excavator of the character described, an A-frame provided with foot-castings having each a pair of terminal lugs connected by a bridge-piece or lift, substantially as described.

7. In an excavator, the combination, with a a body provided with socket-pieces, of an A- frame each leg whereof is provided with two parallel terminal lugs having rounded bearing-surfaces to rest on the socket-pieces, and pin connecting said lugs, said body being provided with a jack-support casting on each side, and a U bolt on each side 20 passing over the pin between the lugs, eX-

In testimonywhereof we affiX our signatures in presence of two witnesses.

GEORGE W. KING. HARRY J BARNHART. Witnesses:

F. H. KING, R. G. LUCAS. 

